Fixing band for battery module and battery module

ABSTRACT

The disclosure relates to a fixing band for a battery module and a battery module. The fixing band comprises a first end portion, a connecting section and a second end portion which are arranged successively in an extending direction of the fixing band. The first end portion includes a body and engaging grooves which are protruded in a thickness direction of the body. The engaging grooves are integral with the body. The second end portion has engaging protrusions which are shaped to match the engaging grooves. The first end portion and the second end portion are laminated in the thickness direction and are engaged with each other by the engaging grooves and the engaging protrusions, so that the fixing band encloses an annular accommodation space.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority to Chinese PatentApplication No. 201810298047.9 filed on Mar. 30, 2018, which isincorporated herein by reference in its entirety.

TECHNICAL FIELD

The disclosure relates to the technical field of battery, and inparticular, to a fixing band for a battery module and a battery module.

BACKGROUND

In the conventional technology, the battery module generally comprises abattery stack which is formed by laminating a plurality of batteries andend plates which are disposed on two sides of the battery stack, whereinthe end plates on the two sides are respectively welded and fixed to thetwo side plates to resist the expansion force from the batteries.

With the gradual improvement of the battery technology, the marketdemand for the battery module is continuously improved, and thenon-module structure is developed. As compared with the battery modulestructure in the conventional technology, the called non-modulestructure removes the side plates connecting the two end plates. Due tothe removal of the side plates, there is accordingly no connectionbetween the side plates and the end plates to resist the expansion forcefrom each battery. Therefore, in order to resist the expansion forcefrom the batteries, the non-module structure usually employs a fixingband, which cooperates with the end plate to clamp the battery stack andresist the expansion force from the batteries.

However, due to the unreasonable design for the structure of the fixingband in the prior art, the fixing band has a complicated structure atthe joint forming the closed ring body, it is not convenient to overlap,and has poor connection strength, and thus cannot meet the userequirements of the battery module.

Therefore, there is a need for a novel fixing band for the batterymodule and a battery module.

SUMMARY

The embodiments of the disclosure provide a fixing band for a batterymodule and a battery module, wherein the fixing band can be used fortightening the battery stack and the end plates to resist the expansionforce from each battery. Further, the joint of the closed ring formed bythe fixing band has a simple structure, is convenient to be overlapped,and has high connection strength, and therefore can meet the userequirements of the battery module.

In one aspect of an embodiment of the disclosure, a fixing band for abattery module is provided, comprising a first end portion, a connectingsection and a second end portion which are arranged successively in anextending direction of the fixing band. The first end portion includes abody and engaging grooves which are protruded in a thickness directionof the body. The engaging grooves are integral with the body. The secondend portion has engaging protrusions which are shaped to match theengaging grooves. The first end portion and the second end portion arelaminated in the thickness direction and are engaged with each other bythe engaging grooves and the engaging protrusions, so that the fixingband encloses an annular accommodation space.

According to one aspect of the embodiment of the disclosure, theengaging grooves have two or more and are spaced apart from each otheron the first end portion in the extending direction, and the engagingprotrusions have two or more and are spaced apart from each other on thesecond end portion in the extending direction.

According to one aspect of the embodiment of the disclosure, theengaging groove is formed by stamping the first end portion in thethickness direction, and the engaging protrusion is formed by stampingthe second end portion in the thickness direction.

According to one aspect of the embodiment of the disclosure, a firstclamping groove is formed between a groove wall of the engaging grooveand the body, the first clamping groove extends in the extendingdirection, and the engaging protrusion has a first latching portionwhich is capable of extending to the first clamping groove to preventthe first end portion and the second end portion from being separatedfrom each other.

According to one aspect of the embodiment of the disclosure, the secondend portion comprises a main body and the engaging protrusions which areprotruded in the thickness direction, a second clamping groove is formedbetween the engaging protrusion and the main body, the second clampinggroove extends in the extending direction, and the body has a secondlatching portion which is capable of extending to the second clampinggroove.

According to one aspect of the embodiment of the disclosure, the groovewall of the engaging groove comprises an outer head portion, an outerconnecting portion and an outer tail portion which are successivelyarranged in the extending direction, the outer connecting portiongradually increases in width from the outer head portion to the outertail portion. Further, the engaging protrusion comprises an inner headportion, an inner connecting portion and an inner tail portion which aresuccessively arranged in the extending direction, the inner connectingportion gradually increases in width from the inner head portion to theinner tail portion, and the first latching portion is located on theinner connecting portion.

According to one aspect of the embodiment of the disclosure, the outerconnecting portion is connected to the outer head portion and the outertail portion using a circular arc transition, and/or the innerconnecting portion is connected to the inner head portion and the innertail portion using a circular arc transition.

According to one aspect of the embodiment of the disclosure, in a widthdirection of the fixing band, the outer head portion has a width smallerthan a width of the outer tail portion, the inner head portion has awidth equal to the width of the outer head portion, at least a partialregion of the inner connecting portion has a width greater than a widthof a corresponding position of the outer connecting portion to the atleast partial region, and the inner tail portion has a width equal tothe width of the outer tail portion.

According to an aspect of the embodiment of the disclosure, the fixingband further comprises a stopping portion, which is provided at thefirst end portion and the second end portion to prevent the first endportion and the second end portion from being separated from each other.

According to one aspect of the embodiment of the disclosure, thestopping portion comprises a limiting hole which is provided at one ofthe first end portion and the second end portion, and a limitingprotrusion which is provided at the other of the first end portion andthe second end portion, and the limiting protrusion is received in thelimiting hole and abuts against a hole wall of the limiting hole.

According to one aspect of the embodiment of the disclosure, thelimiting protrusion is provided at the first end portion and is formedby stamping the first end portion; or, the limiting protrusion isprovided at the second end portion and is formed by stamping the secondend portion.

The fixing band for the battery module according to the embodiment ofthe disclosure includes a first end portion, a connecting section and asecond end portion which are arranged successively in an extendingdirection of the fixing band. The first end portion includes a body andengaging grooves which are protruded in a thickness direction of thebody. The engaging grooves are integral with the body. The second endportion has engaging protrusions which are shaped to match the engaginggrooves. The fixing band may be disposed to enclose the battery stackand the end plates of the battery module when applied into the batterymodule, so that the first end portion and the second end portion arelaminated in the thickness direction of the body and are engaged witheach other by the engaging grooves and the engaging protrusions.Therefore, the battery stack and the end plates are held and fixedwithin the accommodation space enclosed by the fixing band, and thus thefixing band can tighten the battery stack and the end plates and canwithstand the expansion force from the batteries. Meanwhile, the jointof the fixing band employs the connection of engaging the engaginggrooves integral with the body of the first end portion with theengaging protrusions provided at the second end portion, so the jointhas a simple structure, is convenient to be overlapped, and has highconnection strength, and therefore can meet the use requirements of thebattery module.

In another aspect of the embodiment of the disclosure, a battery moduleis provided, comprising a battery stack, which includes a plurality ofbatteries which are laminated; two end plates, which are spaced apartfrom each other and are disposed to hold the battery stack; and theabove mentioned fixing band. The fixing band encloses the battery stackand the two end plates, and the first end portion and the second endportion are laminated in the thickness direction and are engaged witheach other by the engaging grooves and the engaging protrusions, so thatthat the battery stack and the two end plates are held and fixed withinthe accommodation space.

BRIEF DESCRIPTION OF THE DRAWINGS

Features, advantages, and technical effects of exemplary embodiments ofthe disclosure will be described below with reference to theaccompanying drawings.

FIG. 1 shows an overall structural view of a fixing band for a batterymodule according to an embodiment of the disclosure;

FIG. 2 shows an enlarged view of a portion A in FIG. 1;

FIG. 3 shows a partial structural view of a first end portion accordingto an embodiment of the disclosure;

FIG. 4 shows a partial structural view of a second end portion accordingto an embodiment of the disclosure;

FIG. 5 shows a front view of the structure shown in FIG. 3;

FIG. 6 shows a cross-sectional view taken along the direction B-B inFIG. 5;

FIG. 7 shows a front view of the structure shown in FIG. 4;

FIG. 8 shows a cross-sectional view taken along the direction C-C inFIG. 7;

FIG. 9 shows a partial structural view of the first end portion engagingwith the second end portion;

FIG. 10 shows a front view of FIG. 9;

FIG. 11 shows an enlarged view of a portion F in FIG. 10;

FIG. 12 shows a cross-sectional view taken along the direction D-D inFIG. 10;

FIG. 13 shows an enlarged view of a portion E in FIG. 12; and

FIG. 14 shows a schematic structural view of a battery module accordingto an embodiment of the disclosure.

In the drawings, the same reference numerals are used for the sameparts. The figures are not drawn to the actual scale.

DETAILED DESCRIPTION

Features and exemplary embodiments according to various aspects of thedisclosure are described in detail below. In the following detaileddescription, numerous specific details are set forth to providecomprehensive understanding of the disclosure. However, it will beapparent to the skilled in the art that the disclosure may be practicedwithout some of the specific details. The following description of theembodiments is merely to provide a better understanding of thedisclosure. In the figures and the following description, at least someof the known structures and techniques are not shown, to avoidunnecessarily obscuring the disclosure. Further, for clarity, thedimension of some of the structures may be enlarged. Furthermore, thefeatures, structures, or characteristics described hereinafter may becombined in any suitable manner in one or more embodiments.

The orientation terms appearing in the following description refer tothe directions shown in the drawings, and are not intended to limit thespecific structure of the fixing band and the battery module of thedisclosure. In the description of the disclosure, it should be notedthat, unless otherwise stated, the terms “mount” and “connect” are to beunderstood broadly, for example, they may be fixed connection ordetachable connection or integral connection; or may be directconnection or indirect connection. The specific meaning of the aboveterms in the disclosure may be understood by the skilled in the artbased on the specific situation.

The fixing band provided in the embodiment of the disclosure is appliedinto the battery module and used in combination with the end plates ofthe battery module for holding and fixing the battery stack of thebattery module and resisting the expansion force from each battery. Thedisclosure can meet the development trend of the non-module structure inthe battery technology, and meantime can meet the use requirement of thebattery module, since the joint has a simple structure, is convenient tobe overlapped, and has high connection strength.

In order to better understand the disclosure, a fixing band 1 for abattery module and a battery module according to embodiments of thedisclosure are described in detail with reference to FIGS. 1 to 14.

FIG. 1 shows an overall structural view of a fixing band 1 for a batterymodule according to an embodiment of the disclosure. As shown in FIG. 1,the fixing band 1 provided in the embodiment of the disclosure has astrip-like structure with a certain width and is made of a rigidmaterial. The width of the fixing band 1 is not limited to a specificvalue, but may be determined according to the rigidity of the fixingband 1 and the number of batteries required to withstand the expansionforce. The rigid material may be metal, alloy, or the like.

FIG. 2 shows an enlarged view of a portion A in FIG. 1, and FIG. 3 showsa partial structural view of the first end portion 10 according to anembodiment of the disclosure. As shown in FIGS. 2 and 3, the fixing band1 comprises a first end portion 10, a connecting section 20 and a secondend portion 30, which are arranged successively in an extendingdirection m of the fixing band 1. The first end portion 10, theconnecting section 20 and the second end portion 30 are integral andhave the same width. The first end portion 10 includes a body 11 andengaging grooves 12 which are formed in a thickness direction h of thebody 11. The engaging grooves 12 are integral with the body 11. Thesecond end portion 30 has engaging protrusions 32 which are shaped tomatch the engaging grooves 12. The first end portion 10 and the secondend portion 30 are laminated in the thickness direction h and areengaged with each other by the engaging grooves 12 and the engagingprotrusions 32, so that the fixing band 1 encloses an annularaccommodation space 40.

The engaging groove 12 of the first end portion 10 may be formed bywelding, casting and machining, or the like. However, the engaginggroove 12 of the first end portion 10 is preferably formed by stampingthe first end portion 10 in the thickness direction h of the body 11.The engaging groove 12 is formed by stamping. Particularly, the engaginggroove 12 is formed, by firstly scribing and cutting the first endportion 10 at a position where the engaging groove 12 is requiredaccording to the shape of the engaging groove 12, so that the groovewall of the engaging groove 12 is separated from the body 11 of thefirst end portion 10 in the width direction d of the fixing band 1, andthen stamping the scribed position of the first end portion 10 in thethickness direction h.

FIG. 4 shows a partial structural view of a second end portion accordingto an embodiment of the disclosure. As shown in FIG. 4, the second endportion 30 includes a main body 31 which is laminated with the first endportion 10 and the engaging protrusions 32 which are engaged with theengaging grooves 12. The main body 31 is integral with the engagingprotrusions 32. The engaging protrusion 32 of the second end portion 30may be formed in the same manner as that of the engaging groove 12, thatis, may be formed by welding, casting and machining, or the like.However, the engaging protrusion 32 of the second end portion 30 ispreferably stamping the second end portion 30 in the thickness directionh of the main body 31. Particularly, the engaging protrusion 32 isformed, by firstly scribing and cutting the second end portion 30 at aposition where the engaging protrusion 32 is required according to theshape of the engaging protrusion 32, so that a part of the engagingprotrusion 32 is separated from the body 11 of the second end portion 30in the width direction d of the fixing band 1, and then stamping thescribed position of the second end portion 30 in the thickness directionh.

After the engaging protrusion 32 and the engaging groove 12 are formed,the corresponding positions of the fixing band 1 may be bent accordingto use requirements, so that the body 11 of the first end portion 10 andthe main body 31 of the second end portion 30 are laminated with eachother, and the engaging groove 12 and the engaging protrusion 32 areengaged with each other to form an overlap joint as shown in FIG. 2.

The engaging grooves 12 are integral with the body 11, and the engagingprotrusion 32 are integral with the main body 31, therefore, it is easyto process and overlap the first end portion 10 and the second endportion 30. Meanwhile, the engaging grooves 12 protrude in the thicknessdirection h of the body 11, and the engaging protrusions 32 are formedin the thickness direction h of the main body 31. Of course, thethickness direction h of the body 11 coincides with the thicknessdirection h of the main body 31. Through the force analysis, theengaging protrusions 32 and the engaging grooves 12 provided in theembodiment of the disclosure, when subjected to the expansion force fromthe batteries after are engaged with each other, as compared with thearrangement of the connecting piece applied at the two free end portionsof the steel strip, it is not only easy to process, assemble, andcost-effective, but it is also possible to make the connection strengthbetween the two free end portions (i.e., the first end portion 10 andthe second end portion 30) higher. Therefore, the connection strengthbetween the two free end portions is not easily detached or broken.

FIG. 5 shows a front view of the structure shown in FIG. 3, and FIG. 6shows a cross-sectional view taken along the direction B-B in FIG. 5. Asshown in FIGS. 5 and 6, as an alternative embodiment, the body 11 of thefirst end portion 10 has a strip-like structure with a certain width andis provided with openings corresponding to the engaging grooves 12. Thegroove wall of the engaging groove 12 comprises an outer head portion121, an outer connecting portion 122 and an outer tail portion 123 whichare successively arranged in the extending direction m. The outer headportion 121 and the outer tail portion 123 each has a strip-likestructure of equal width in the extending direction m. The outerconnecting portion 122 gradually increases in width from the outer headportion 121 to the outer tail portion 123, and has a trapezoidalstructure. The engaging groove 12 is formed by connecting the groovewall of the engaging groove 12 to the body 11 by the end portionsurfaces of the outer head portion 121 and the outer tail portion 123respectively.

In order to avoid stress concentration at the connection of the outerconnecting portion 122 with the outer head portion 121 and the outertail portion 123 respectively, as an alternative embodiment, the outerconnecting portion 122 is connected with the outer head portion 121 andthe outer tail portion 123 using a circular arc transition. Therefore,stress concentration is avoided, and rigidity and service life of thefixing band 1 are ensured.

FIG. 7 shows a front view of the structure shown in FIG. 4, and FIG. 8shows a cross-sectional view taken along the direction C-C in FIG. 7. Asshown in FIGS. 7 and 8, as an alternative embodiment, the main body 31of the second end portion 30 has substantially the same structure as thebody 11 of the first end portion 10. In other words, the main body 31 ofthe second end portion 30 also has a strip-like structure with a certainwidth and is provided with openings corresponding to the engagingprotrusions 32. The engaging protrusion 32 includes an inner headportion 321, an inner connecting portion 322 and an inner tail portion323 which are successively arranged in the extending direction m. Theinner head portion 321 and the inner tail portion 323 each has astrip-like structure of equal width in the extending direction m. Theinner connecting portion 322 gradually increases in width from the innerhead portion 321 to the inner tail portion 323, and has a trapezoidalstructure as a whole.

In order to avoid stress concentration at the connection of the innerconnecting portion 322 with the inner head portion 321 and the innertail portion 323, as an alternative embodiment, the inner connectingportion 322 is connected to the inner head portion 321 and the innertail portion 323 using a circular arc transition. Therefore, stressconcentration is avoided, and rigidity and service life of the fixingband 1 are ensured.

FIG. 9 shows a partial structural view of the first end portion engagingwith the second end portion. FIG. 10 shows a front view of FIG. 9. FIG.11 shows an enlarged view of a portion F in FIG. 10. FIG. 12 shows across-sectional view taken along the direction D-D in FIG. 10.

In order to further prevent the first end portion 10 and the second endportion 30 from separating from each other in the thickness direction hand to ensure the connection strength of the first end portion 10 andthe second end portion 30, as an alternative embodiment, a firstclamping groove 13 is formed between the groove wall of the engaginggroove 12 and the body 11. The first clamping groove 13 extends in theextending direction m. The engaging protrusion 32 has a first latchingportion 324 capable of extending to the first clamping groove 13. Inthis embodiment, the first latching portion 324 is provided at the innerconnecting portion 322 of the engaging protrusion 32. When the engaginggroove 12 and the engaging protrusion 32 are engaged with each other,the first latching portion 324 extends to the first clamping groove 13,so that the movement of the first end portion 10 and the second endportion 30 are limited in the thickness direction h so as to prevent thefirst end portion 10 and the second end portion 30 from separating fromeach other in the thickness direction h.

More preferably, a second clamping groove 33 is formed between theengaging protrusion 32 of the second end portion 30 and the main body31. The second clamping groove 33 extends in the extending direction m.The body 11 has a second latching portion 111 capable of extending tothe second clamping groove 33. That is, with the above arrangement, thegroove wall of the engaging groove 12 of the first end portion 10 andthe body 11, and the engaging protrusion 32 of the second end portion 30and the main body 31 are arranged successively and laminated with eachother in the thickness direction h. Therefore, the first end portion 10and the second end portion 30 can not only be prevented from separatingfrom each other in the thickness direction h, and the first end portion10 and the second end portion 30 can also be prevented from detachingfrom each other toward the direction away from each other in theextending direction m of the entire fixing band 1. The above and thefollowing term “the direction away from each other” refers to thedirection in which the first end portion 10 and the second end portion30 are separated from each other so that the annular accommodation space40 enclosed by the fixing band 1 is opened.

In order to provide guidance when the first end portion 10 and thesecond end portion 30 are assembled with each other and to limitmovement of the first end portion 10 and the second end portion 30toward the direction away from each other, as an alternative embodiment,in the width direction d of the entire fixing band 1, the outer headportion 121 has a width smaller than the width of the outer tail portion123, the inner head portion 321 has a width equal to the width of theouter head portion 121. At least a partial region of the innerconnecting portion 322 has a width larger than the width of acorresponding position of the outer connecting portion 122 to the atleast a partial region of the inner connecting portion 322. Thecorresponding position refers to a position where the inner connectingportion 322 and the outer connecting portion 122 are laminated relativeto each other when the first end portion 10 and the second end portion30 are laminated with each other in the thickness direction h. With theabove arrangement, when the first end portion 10 and the second endportion 30 overlap each other, they are laminated in advance, and theorientation of the outer head portion 121 is the same as that of theinner head portion 321, and then the second end portion 30 is pulled, sothat the inner head portion 321, the inner connecting portion 322 andthe inner tail portion 323 of the second end portion 30 are sequentiallyslid into the outer head portion 121, the outer connecting portion 122and the outer tail portion 123. Meanwhile, the first latching portion324 enters the first clamping groove 13, and the second latching portion111 enters the second clamping groove 33, so that when the fixing band 1is subjected to the expansion force from the batteries after appliedinto the battery module, the outer head portion 121 of the first endportion 10 can limit the movement of the inner connecting portion 322 ofthe second end portion 30 to hold the inner connecting portion 322.Therefore, the first end portion 10 and the second end portion 30 areprevented from moving away from each other in the extending direction m.

Preferably, in the width direction d, the width of all the regions ofthe inner connecting portion 322 is larger than the width of thecorresponding position of the outer connecting portion 122 to all theregions of the inner connecting portion 322. Therefore, the connectionstrength requirements between the first end portion 10 and the secondend portion 30 can be ensured well.

The engaging grooves 12 on the first end portion 10 provided in theembodiment of the disclosure have four and are spaced apart from eachother. The engaging protrusions 32 on the second end portion 30 have thesame number as the engagement grooves 12 on the first end portion 10 andare spaced apart from each other on the second end portion 30. Eachengaging groove 12 and each engaging protrusion 32 correspond to eachother. However, the arrangement is not limited to the described above.In some alternative embodiments, depending on the specificcircumstances, the number of engaging grooves 12 and engagingprotrusions 32 may be less than four (for example two) or more than four(for example five, six, or even more). Meanwhile, the number of theengaging grooves 12 and the number of the engaging protrusions 32 arenot limited to the same, and may be different, for example, the numberof the engaging grooves 12 may be larger than the number of the engagingprotrusions 32, so that the fixing band 1 can adjust the engaginggrooves 12 matching with the engaging protrusions 32 according to thespecification and model of the battery module in which the fixing bandis applied. Therefore, the fixing band 1 can be applied into a pluralityof battery modules of different specifications, so that the fixing band1 has a wider use range.

In the present embodiment, the outer head portion 121 of each engaginggroove 12 on the first end portion 10 faces the side of the first endportion 10 remote from the connecting section 20, and the inner portion321 of each engaging protrusion 32 on the second end portion 30 facesthe side of the second end portion 30 near the connecting section 20.After the four engaging protrusions 32 are engaged with the fourengaging grooves 12, the first end portion 10 and the second end portion30 can be prevented from being separated from each other.

FIG. 13 shows an enlarged view of a portion E in FIG. 12. Since theorientations of the outer head portions 121 of the four engaging grooves12 on the first end portion 10 are same, and the orientations of theinner head portions 321 of the four engaging protrusions 32 on thesecond end portion 30 are same, it is possible to provide a limiting forthe first end portion 10 and the second end portion 30 toward thedirection away from each other. In order to prevent the first endportion 10 and the second end portion 30 from moving toward thedirection near to each other in the extending direction m due toincorrect operation of the operator during assembly or handling, therebycausing the engaging groove 12 and the engaging protrusion 32 to beseparated from each other, as an alternative embodiment, the fixing band1 further comprises a stopping portion 50, as shown in FIG. 13. Thestopping portion 50 is provided at the first end portion 10 and thesecond end portion 30, to prevent the first end portion 10 and thesecond end portion 30 from being separated from each other, andparticularly, to prevent the first end portion 10 and the second endportion 30 from moving toward the direction near to each other.Therefore, the first end portion 10 and the second end portion 30 arelimited in all directions after being overlapped with each other, andthereby the connection between the first end portion 10 and the secondend portion 30 is more stable.

In the present embodiment, the stopping portion 50 includes a limitinghole 51, which is provided at the first end portion 10, and a limitingprotrusion 52, which is provided at the second end portion 30. The outercontour shape of the limiting protrusion 52 is shaped to match the outercontour shape of the limiting hole 51. The limiting protrusion 52 can bereceived in the limiting hole 51 and abut against the hole wall of thelimiting hole 51, so as to limit the relative movement of the first endportion 10 and the second end portion 30 in the extending direction m(i.e., in the thickness direction h).

The limiting hole 51 in the first end portion 10 may be formed byvarious processes, such as by machining, preferably by stamping. Thelimiting protrusion 52 may be formed by welding a protrusion onto thesecond end portion 30, of course, preferably by stamping. Particularly,a U-shaped groove portion is cut firstly in the main body 31 of thesecond end portion 30, the cut U-shaped groove portion is opposed to thelimiting hole 51, and then the U-shaped groove portion is stamped. Theformed protrusion is the limiting protrusion 52 and may enter thelimiting hole 51. Therefore, the limiting protrusion 52 together withthe engaging groove 12 and the engaging protrusion 32 can furtherimprove the connection strength of the first end portion 10 and thesecond end portion 30.

It is understood that the limiting hole 51 is not limited to be providedat the first end portion 10, and the limiting protrusion 52 is notlimited to be provided at the second end portion 30. In some alternativeembodiments, the limiting hole 51 may be provided at the second endportion 30 and the limiting protrusion 52 may be provided at the firstend portion 10. This arrangement can also play the correspondinglimiting function, and may be formed by stamping, which will not bedescribed here.

Meanwhile, it is understood that the stopping portion 50 is not limitedto the form of the limiting hole 51 and the limiting protrusion 52,however, the structure which can cooperate with the engaging groove 12and the engaging protrusion 32 to limit the movement of the first endportion 10 and the second end portion 30 is applicable. For example,rivets may also be used.

In order to facilitate manufacture and installation, in the embodimentof the disclosure, the orientations of the outer head portions 121 ofthe four engaging grooves 12 on the first end portion 10 are provided tobe the same, and the orientations of the inner head portions 321 of thefour engaging protrusions 32 on the second end portion 30 are providedto be the same, and accordingly, the stopping portion 50 is provided. Ofcourse, the engaging protrusion 32 and the engaging groove 12 may beassembled in other manners. In the case where the engaging groove 12 andthe engaging protrusion 32 are integral and engaged with each other, thestopping portion 50 may not be provided. For example, the orientationsof the outer head portions 121 and the inner head portions 321 of one ormore groups of the engaging grooves 12 and the engaging protrusions 32are opposite to the orientations of the outer head portions 121 and theinner head portions 321 of other groups of the engaging grooves 12 andthe engaging protrusions 32. In such case, movement of the first endportion 10 and the second end portion 30 can be limited in the directionaway from each other and/or in the direction near to each other by theengagement of the engaging groove 12 and the engaging protrusion 32.

In this way, the fixing band 1 for the battery module provided in theembodiment of the disclosure may be disposed to enclose the batterystack and the end plates of the battery module when applied into thebattery module, so that the first end portion 10 and the second endportion 30 are laminated in the thickness direction h of the body 11 andare engaged with each other by the engaging grooves 12 and the engagingprotrusions 32. Therefore, the battery stack and the end plates are heldand fixed within the accommodation space 40 enclosed by the fixing band1, and thus the fixing band 1 can tighten the battery stack and the endplates and can withstand the expansion force from the batteries.Meanwhile, since the joint of the fixing band 1 employs the connectionof engaging the engaging groove 12 integral with the body 11 of thefirst end portion 10 with the engaging protrusion 32 provided at thesecond end portion 30, the joint has a simple structure, is convenientto be overlapped, and has high connection strength. Further, the shapeof the engaging groove 12 and the corresponding engaging protrusion 32and the arrangement of the stopping portion 50 make the connectionstrength of the first end portion 10 and the second end portion 30higher. Therefore, the use requirements of the battery module can bemet.

FIG. 14 is a schematic structural view of a battery module according toan embodiment of the disclosure. As shown in FIG. 14, the battery moduleprovided in the embodiment of the disclosure includes a battery stack 2,two end plates 3, and a fixing band 1 according to the aboveembodiments. The battery stack 2 includes a plurality of batteries 201which are laminated. The two end plates 3 are disposed to be spacedapart from each other and to sandwich the battery stack 2. The fixingband 1 is disposed to enclose the battery stack 2 and the two end plates3. The first end portion 10 and the second end portion 30 are laminatedin the thickness direction h and engaged with each other by the engaginggrooves 12 and the engaging protrusions 32, so that the battery stack 2and the two end plates 3 are sandwiched and fixed within theaccommodation space 40.

The battery module provided in the embodiment of the disclosure includesthe fixing band 1 provided in any of the above embodiments, so it cancooperate with the two end plates 3 to resist the expansion force fromeach battery 201 in the battery stack 2. Further, the fixing band 1 iseasily assembled, has high connection strength, and therefore, thesafety performance and the service life of the battery module areimproved.

Although the disclosure has been described with reference to preferredembodiments, various modifications may be made and components thereinmay be replaced with equivalents without departing from the scope of thedisclosure. In particular, the technical features mentioned in thevarious embodiments may be combined in any manner as long as there is nostructural conflict. The disclosure is not limited to the specificembodiments disclosed herein, but includes all technical solutionsfalling within the scope of the claims.

REFERENCE NUMERALS

-   -   m extending direction    -   h thickness direction    -   d width direction    -   1 fixing band    -   10 first end portion    -   11 body    -   111 second latching portion    -   12 engaging groove    -   121 outer head portion    -   122 outer connecting portion    -   123 outer tail portion    -   13 first clamping groove    -   20 connecting section    -   30 second end portion    -   31 main body    -   32 engaging protrusion    -   321 inner head portion    -   322 inner connecting portion    -   323 inner tail portion    -   324 first latching portion    -   33 second clamping groove    -   40 accommodation space    -   50 stopping portion    -   51 limiting hole    -   52 limiting protrusion    -   2 battery stack    -   201 battery    -   3 end plate

What is claimed is:
 1. A fixing band for a battery module, comprising afirst end portion, a connecting section and a second end portion whichare arranged successively in an extending direction of the fixing band,wherein the first end portion includes a body and engaging grooves whichprotrude in a thickness direction of the body, the engaging grooves areintegral with the body, each of the engaging grooves comprises a groovewall, the groove wall of each of the engaging grooves is separated fromthe body of the first end portion in a width direction of the fixingband, the second end portion has engaging protrusions which are shapedto match the engaging grooves, and the first end portion and the secondend portion are laminated in the thickness direction and are engagedwith each other by the groove walls of the engaging grooves and theengaging protrusions, so that the fixing band is configured to enclosean annular accommodation space, a first clamping hole is formed betweenthe groove wall of the engaging groove and the body of the first endportion, the first clamping hole penetrates through the groove wall ofthe engaging groove along the width direction, and the engagingprotrusion of the second end portion has a first latching portion whichis capable of extending through the first clamping hole to prevent thefirst end portion and the second end portion from being separated fromeach other, and the second end portion comprises a main body and theengaging protrusions which are protruded in the thickness direction, asecond clamping hole is formed between the engaging protrusion and themain body of the second end portion, the second clamping hole penetratesthrough a side wall of the engaging protrusion along the widthdirection, and the body of the first end portion has a second latchingportion which is capable of extending to the second clamping hole. 2.The fixing band according to claim 1, wherein the engaging grooves havetwo or more and are spaced apart from each other on the first endportion in the extending direction, and the engaging protrusions havetwo or more and are spaced apart from each other on the second endportion in the extending direction.
 3. The fixing band according toclaim 1, wherein the engaging groove is formed by stamping the first endportion in the thickness direction, and the engaging protrusion isformed by stamping the second end portion in the thickness direction. 4.The fixing band according to claim 1, wherein the fixing band furthercomprises a stopping portion, which is provided at the first end portionand the second end portion to prevent the first end portion and thesecond end portion from being separated from each other.
 5. The fixingband according to claim 4, wherein the stopping portion comprises alimiting hole which is provided at one of the first end portion and thesecond end portion, and a limiting protrusion which is provided at theother of the first end portion and the second end portion, and thelimiting protrusion is received in the limiting hole and abuts against ahole wall of the limiting hole.
 6. The fixing band according to claim 5,wherein the limiting protrusion is provided at the first end portion andis formed by stamping the first end portion; or, the limiting protrusionis provided at the second end portion and is formed by stamping thesecond end portion.
 7. A battery module, comprising: a battery stack,which includes a plurality of batteries which are stacked side by side;and two end plates, which are spaced apart from each other and aredisposed to hold the battery stack; wherein the battery module furthercomprises the fixing band according to claim 1, wherein the fixing bandencloses the battery stack and the two end plates, and the first endportion and the second end portion are laminated in the thicknessdirection and are engaged with each other by the groove walls of theengaging grooves and the engaging protrusions, so that that the batterystack and the two end plates are held and fixed within the accommodationspace.
 8. The fixing band according to claim 1, wherein the groove wallof the engaging groove comprises an outer head portion, an outerconnecting portion and an outer tail portion which are successivelyarranged in the extending direction, the outer connecting portiongradually increases in width from the outer head portion to the outertail portion; and the engaging protrusion comprises an inner headportion, an inner connecting portion and an inner tail portion which aresuccessively arranged in the extending direction, the inner connectingportion gradually increases in width from the inner head portion to theinner tail portion.
 9. The fixing band according to claim 8, wherein theouter connecting portion is connected to the outer head portion and theouter tail portion using a circular arc transition, and/or the innerconnecting portion is connected to the inner head portion and the innertail portion using a circular arc transition.
 10. The fixing bandaccording to claim 8, wherein in the width direction of the fixing band,the outer head portion has a width smaller than a width of the outertail portion, the inner head portion has a width equal to the width ofthe outer head portion, at least a partial region of the innerconnecting portion has a width greater than a width of a correspondingposition of the outer connecting portion to the at least partial region,and the inner tail portion has a width equal to the width of the outertail portion.